Depending on the condition of it and the level of engraving it could be worth between $300.00- $1800.00. The later price is for a near perfect highly engraved model D. Some might pay a bit more (if they really had a sweet spot for it) and as always there are many who couldn't care less about it and would low-ball the price. Either way, you must grade its condition according to a reputable gun collecting price guide and not your own opinion!
Most likely, the pump shotgun you have is a model 10. Uncheckered wood, grooved slide, value is from 150 to 300 dollars.
Not marked, Model 9
Remington didn't make a pump shotgun until 1908 and that's a model 10.
100-750 USD
With the serial number that you have supplied,your Remington model 1903 rifle was made in the year 1941.
Pretty much almost impossible to tell the model just by the sn.
Your Remington model 1903 was made in the year 1941,with the serial number that you have provided.
Depending on condition 300-700
I just so happen to own a Remington UMC model 10, actually it is pre model 10, they did not name this the model 10 until 1911 I believe. Mine actually has the dates 1903 and 1905 on it. But to get to your answer it stands for UNION METALLIC CARTRIDGE.
Depends on condition and parts originality. Range from 300-800
A UMC CAN'T be circa 1903, it didn't become Remington UMC until 1912. I believe by the time UMC took over the model was on the receiver, it's probably a model 12 or possibly a later 121 if it's not quite as old. The value is GREATLY dependent on the condition, condition, and the condition, and of course which model and variation.
1941